| 摘要 |
PROBLEM TO BE SOLVED: To provide a permanent magnet type motor, capable of properly controlling the magnetic flux amount due to a permanent magnet in accordance with the number of rotations or a load, without causing adverse effects on torque controllability. SOLUTION: A permanent magnet 10 of a rotor 4 is constituted of a combination of a high-coercive force magnet portion 11 and a low-coercive force magnet portion 12, a composite current containing a fundamental component of the drive frequency and the harmonic components is applied to an armature coil 6 of a stator 2, and the magnetization state of the low coercive force magnet portion 12 is controlled by the harmonic component of the composite current. COPYRIGHT: (C)2011,JPO&INPIT
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